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Thanks very much.

"Old" was used by someone at the plumbing supply, which greatly surprised me. House built in '97. I'd never have considered anything old yet. What does a vacuum breaker do, exactly?

thanks. the plumber took away the old parts, so no more pics avail. after his installation of a new Koehler unit, there was no flow, so he took off something and found a piece of mangled O-Ring that had been impeding flow. Giving rise to my suspicion that had been the problem all along; blocked...

This could be a pressure relief valve, I'm not sure. Anyway, it's a Moen, and started spraying water outward.